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MEW Chem 1031 Test 1 review answers
Course: CHEM 1031, Fall 2008School: Colorado
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Word Count: 378
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Which 1. statements include exact numbers? I. Angel Falls in Venezuela is 3212 ft high II. There are nine known planets in the solar system III. There are 1000 mm in 1 m a. II. and III. 2. How many significant figures are in the number 3.0900 x 104? a. 5 3. Give the oxidation number of nitrogen in NH2OH a. -1 4. Identify the reducing agent in the following equation: 8H+(aq) + 6Cl-(aq) + Sn(s) + 4NO3- SnCl6 2-(aq)...
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Which 1. statements include exact numbers? I. Angel Falls in Venezuela is 3212 ft high II. There are nine known planets in the solar system III. There are 1000 mm in 1 m a. II. and III. 2. How many significant figures are in the number 3.0900 x 104? a. 5 3. Give the oxidation number of nitrogen in NH2OH a. -1 4. Identify the reducing agent in the following equation: 8H+(aq) + 6Cl-(aq) + Sn(s) + 4NO3- SnCl6 2-(aq) + 4NO2 (g) + 4H2O (l) a. Sn 5. What is the oxidation number of Cl2 ? a. 0 6. Activation energy is: a. the minimum amount of energy required to start a reaction 7. What is the largest anthropogenic source of NO (g) in the atmosphere: a. Automobiles 8. Calculate the work done in J by a chemical reaction if the volume increases from 3.2 L to 3.4 L against a constant external pressure of 3.6 atm. (1 L*atm = 101 J) a. -70 J 9. How much heat is needed to warm 250-g of water from 22 oC to 98 oC ( c of water = 4.18 J/g*K) a. 7.9 x 104 J 10. What is the SI unit for temperature? a. Kelvin
11. The volume of a cell is 1.72 m3. What is the volume of 105 in cells liters (L)? a. 1.72 x 10-10 L 12. An element is defined as: a. The simplest type of a substance with unique physical and chemical properties. 13. How many protons are in 36Ar? a. 18 14. What monatomic ion does calcium form? a. Ca2+ 15. Give the name and formula of the compound formed from an element with an atomic number of 17 and an element with an atomic number of 38. a. SrCl2, strontium chloride 16. Determine the molecular weight of ammonium sulfate. a. 132.06 g/mol 17. What is the correct formula for barium oxide? a. BaO 18. What is the correct formula for the nitrate ion? a. NO319. When correctly balanced, what is ...
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Colorado - CHEM - 1031
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